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Run dartanalyzer in strong mode:
(cd pkg/kernel && dartanalyzer --strong bin lib test)
Run unit tests of kernel, front_end, and dart2js that are directly affected:
./tools/test.py pkg/kernel -mrelease --checked ./tools/test.py pkg/front_end -mrelease --checked ./tools/test.py dart2js/kernel -mrelease --checked
Run end-to-end tests using dartk + VM:
./tools/test.py -m release -c dartk language
Optionally (this is slow) run end-to-end tests using AOT:
./tools/build.py dart_precompiled_runtime ./tools/test.py -cdartkp -rdart_precompiled language co19
Comparing the output of compiling dart2js before and after the change. This script can make it easier to compare the results.